Enhanced radiative recombination rate for electron-hole droplets in a silicon photonic crystal nanocavity

Toshiyuki Ihara, Yasushi Takahashi, Susumu Noda, and Yoshihiko Kanemitsu
Phys. Rev. B 96, 035303 – Published 10 July 2017
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  • INTRODUCTION
  • SAMPLE STRUCTURE AND EXPERIMENTAL SETUP
  • EXPERIMENTAL RESULTS
  • DISCUSSION
  • CONCLUSIONS
  • ACKNOWLEDGMENTS
    • References

    Abstract

    We investigate photoluminescence (PL) spectra and dynamics of clean silicon photonic crystal nanocavities at 10 K. A sharp emission peak due to the nanocavity mode has the largest intensity when the energy of the nanocavity mode is equal to the emission energy of the electron-hole droplets (EHDs). Time-resolved PL spectroscopy indicates that the PL lifetime of the EHD is reduced to as short as 1.2 ns by the nanocavity mode. A careful analysis of the lifetimes indicates that the radiative recombination rate for EHD is enhanced by a factor of larger than 5 by the Purcell effect.

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    • Received 25 October 2016
    • Revised 21 April 2017

    DOI:https://doi.org/10.1103/PhysRevB.96.035303

    ©2017 American Physical Society

    Physics Subject Headings (PhySH)

    1. Research Areas
    Photonic crystals
    1. Techniques
    Time-resolved photoluminescence
    Condensed Matter, Materials & Applied Physics

    Authors & Affiliations

    Toshiyuki Ihara1,*, Yasushi Takahashi2, Susumu Noda3,4, and Yoshihiko Kanemitsu1,4

    • 1Institute for Chemical Research, Kyoto University, Uji, Kyoto 611-0011, Japan
    • 2Department of Physics and Electronics, Osaka Prefecture University, Gakuen-cho, Naka-ku, Sakai, Osaka 599-8570, Japan
    • 3Department of Electronic Science and Engineering, Kyoto University, Katsura, Nishikyo-Ku, Kyoto 615-8510, Japan
    • 4Photonics and Electronics Science and Engineering Center, Kyoto University, Kyoto 615-8510, Japan

    • *Present address: Advanced ICT Research Institute, National Institute of Information and Communications Technology, Kobe 651-2492, Japan.

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    Issue

    Vol. 96, Iss. 3 — 15 July 2017

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